Knsnezow, Der botanistlio Garten der Universität .Iiirjew (Dorpat). 15T 



media, and in pea extract become converted into „bacteroids" as well 

 as straight rods Nitragin doesconsist ofthetubercleorganism, and as 

 a resiilt ot" the inoculation ot' eitlier seeds or soil with it, tubercle 

 formation takes place. Crossing of kinds supplied for difFerent 

 genera and species is quite successful within the tribe Vicieae. 

 In Order to test the possibility and conditions ot" direct infection 

 ot the roots, seedling peas, starting both before and after germi- 

 nation, were groAvn in sterile tubes, by whieh nieans the wiiole 

 plant was kept under control. This method showed that direct 

 infection of quite young radicles is tolerably certain, also of older 

 roots, provided the conditions under which germination occurred 

 are raaintained after infection. 



In Order to secure infection it is not necessary that the 

 organisms should pass through the soil, and the age of the root- 

 hair at the time of infection seems to be without effect upon the 

 result. An accumulation of CO2 round the roots is not the cause 

 of failure in direct infection. 



The addition of nitragin to soils rieh in nitrates appears to 

 be inadvisable, but a supply of it to soil poor in nitrates results 

 in an increased yield, though better results are obtained if instead. 

 of nitragin, nitrates be added to the soil. 



Elliott) L. B.; American Microscopical Society. (Journal uf Applied Microscopy. 

 Vol. I. 1898. No. 9. p. 161 — 168. With iSff.) 



Coiigresse. 



Smith, Erwin F., Botany at the anniversary meeting- of the American 

 Association. II. (Science, "n. S. Vol. VIII. 1898. No. 203. p. 690—700.) 



True, A. C, Tbe Association of American Agricultural Colleges and Experiment 

 «tations. (Science. N. S. Vol. VvII. 1898. No. 205. p. 761 — 764.) 



Original-Bericljte 

 ans bosnischen Gärten wnd Instituten. 



Der Botanische Grarten der Kaiserlichen Universität 

 zu Jurjew (Dorpat). 



Von 



Professor N. J. Kusnezo\v. 



VI. Acelimatisations- Versuche. 



In einer von meinen früheren Abhandlungen*) habe ich auf 

 die Avichtige Bedeutung des Jurjewschen Botanischen Gartens 



*) Vergl. Bot. Centralbl. 1897. Nr. 12, II. Staudenquartiere und im Freien 

 cultivirte Gehölze, p. :{78— 380. 



